I have some dumb case fans. They plug in with the molex connector and run at the same RPM 100% of the time there is power. The computer could be doing nothing and yet the fans are blowing non-existent heat out at the same rate as if it were trying to create a virtual matrix-like world. So what I'd actually like to do is:
if the temperature inside the case is:
* > 30°C/86°F switch the case fans on
* < 25°C/77°F switch the case fans off
i.e. if it's hot, turn them on. If it's cool, switch them off. Make it a 5° difference so they're not always toggling on and off - i.e. if the temperature is between the two values, then the fans continue to do/not do what they were/weren't.
To me this seems like common sense?
Anyone know how to do it? Or if there's a product?